– Addressed an issue that was causing Authentication Success and Failure events with Event ID 4768 to not be logged after installing KB4012216.
– Addressed a bug check encountered on Windows Server 2012 R2 Hyper-V hosts with error code 0xE4 after installing KB4012216.
– Addressed issue where a server may fail with STOP 0x3B error leading to data loss when Input Method Editors (IME) like keyboards are installed.

Known issues in this update

If the PC uses an AMD Carrizo DDR4 processor, installing this update will block downloading and installing future Windows updates.

This update resolves a vulnerability in the Microsoft .NET Framework that could allow remote code execution when the .NET Framework fails to properly validate input before loading libraries. An attacker who successfully exploits this vulnerability could take control of an affected system. The attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights.